Power-hammer.



No. 888,391. PATENTED MAY 19, 1908.

G. E. DAVIS.

POWER HAMMER.

APPLICATION FILED AUG. a. 1906.

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No. 888,391. PATENTED MAY'19, 1908. G. E. DAVIS. POWER HAMMER.

APPLIGATION FILED AUG. 8, 1906.

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No. 888,391. PATENTED MAY 19, 1908.

G. E. DAVIS. POWER HAMMER.

APPLICATION FILED AUG. 8, 1906 3 SHEETS-SHEET 3.

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GEORGE E. DAVIS, OF DUBUQUE, IOWA.

POWER-HAMMER.

Application filed August 8, 1906.

Specification of Letters Patent.

Patented May 19, 1908.

Serial No. 329,734.

To all whom it may concern:

Be it known that I, GEORGE E. DAVIS, a citizen of United States ,residinat Dubuque, in the county of Dubuque and tate of Iowa, have inventedcertain new and useful Imrovements inPowerHammers, of which thefollowing is a specification.

My invention relates to improvements in power hammers, and refersparticularly to the type known as helve hammer and used in blacksmithyand similar work.

The main object of my invention, is the provision of a hammer of thistype which will be well balanced so as to admit of rapid reciprocatingmotion, and a further object is to provide cushioning means to take upthe jar of the blow and relieve the machine of the great strain causedthereby.

My invention also has for its object, to rovide a helve hammer which maybe contro iled at will by means of a single lever, and which will bevery light, simple and durable in construction.

With these objects in view, my invention consists of an anvil carrying adie, standards supporting a helve carrying a die to coact with the dieof the anvil, a shaft and a driven pulley thereon connected by flexiblemeans and adapted to o erate the helve, a loose belt on the drivenuiiey, an idler pulley adapted to engage sai belt, means for operatingthe idler, and a brake to the driven pulley automatically set when theidler is disengaged from the belt.

My invention further consists of a power hammer embodying certain othernovel features of construction, combination and arrangement of partssubstantially as disclosed herein.

Figure 1, is a top plan view of my improved power hammer. Fig. 2, is aside elevation thereof. Fig. 3, is a detail view partly in section toshow the braking means and belt tightener, the full lines indicating thenormal inoperative position, and the dotted lines indicating theoperative position of the parts. Fig. 4, is an end elevation of theupper, middle and lower clamping blocks and staple bolt for clamping thehelve to the helve shaft. Fig. 5, is a side elevation of the lower claming block. Fig. 6, is a top plan view of tffe middle clamping block.Fig. 7, is a similar view of the upper clamping block. Fig. 8, is an endelevation thereof. Fig. 9, is a side elevation of the journal bearingsfor the helve shaft and the web connecting the same.

Fig. 10, is a side elevation of the hammer helve with the hammer inposition therein. Fig. 11, is a detail perspective view of the hammer.Fig. 12, is a top plan view of the hammer helve showin the means forsecuring the swage block t erein. Fig. 13, is a detail perspective viewof the swa e block.

In the drawings: the numeral 1, designates the anvil of the machinepreferably of tapering construction to provide a broad supporting base,and having the die block 2, suitably secured in the head thereof. Ashaft 3, is journaled in and passes through a portion of the base of theanvil, and secured at its ends to said shaft, is a U-shaped foot lever4, which ractically surrounds the base of the anvil. ecured at one endof the shaft is a rocker arm 5, and pivoted to said arm is it shift rod6, whose purpose will be described ater.

Stationed at the proper distance from the anvil, is a hollow base orlatform 7, upon which is mounted the pair of columns or standards 8,provided with suitable brace rods 9. Cap pieces 10, connected by a web10, (see Fig. 9) are secured upon the standards and are semi-circular attheir upper ends to support the lower half 11, of .the journal box, andbolted to said caps are the upper halves or shells 12, which form thecomplete journal bearings for the helve shaft 13. The helve or lever ofthe hammer consists of two substantially parallel rods or bars 14,connected by the spacing bolts 15. A clamp block 16, is mounted upon theupper side of the helve shaft and is provided with grooves or channels17, to receive the bars of the helve. A cap 18, having complementarygrooves is fitted upon the hammer lever, and a staple bolt 19, passesround the clamping block 19, on the lower side of the shaft, through theclamp block and cap, and is provided on its ends with nuts 20, to proerly secure the helve in position upon the s aft. In the forward end ofthe helve or hammer lever is secured the hammer block or die 21, and theblock is secured in position by means of the bolts 22, which engageopenings provided for that purpose in the ends of the block, so that bythe removal of one bolt and the loosening of one other, the die may beentirely removed and reversed or changed as necessary. In the rear endof the helve is secured a block 23 and secured to said block by means ofthe bolts 24 and retaining plate 25, is a leaf spring 26, composed of aseries of spring bands or leaves as shown. The outer ends of the leafspring are connected by the links 27, to the forked end 28, of thepitman 29.

Mounted in bearings 30, on the baseparallel to the helve shaft, is ashaft 31, having rigidly mounted thereon the flanged pulley 32. On theouter end of the shaft 31, is keyed a slotted crank disk33, and a pitmansleeve 34, is secured to the disk by means of a bolt 35, whose headengages the slot in the disk passing through the wrist pin upon whichthe pitman sleeve rotates. This pitman sleeve or socket is adapted toreceive the pitman, which is adjustably secured therein by means of theset screw or bolt 36. Mounted in journal bearings 37, adjacent the shaft31, is a rock shaft 38, provided with a forked extension 39, formed witha sleeve or collar 40. Engaged in said sleeve and adjustably securedtherein by means of the set screw 41, is a rod 42, formed withforkedarms 43,. in which is rotatably mounted the idler pulley 44, adapted toengage the loose belt 45, passing over the driven pulley 32.

Extending downward from the rock shaft 38, is a rocker arm 46, carryinga brake block 47, preferably of wood and adapted to engage "the drivenpulley. To the lower extended end of the rocker arm, is connected a link48, to which is secured a spiral spring 49, and to the other end of thespring is. connected a rod 50, which passes through and is adjustablysecured in the base by means of the adjusting nut 51. This spring exertsits tension to cause the brake block to engage the driven pulley. An armor lever 52, is mounted upon the extended end of the rock shaft and ispivotally connected with the shift rod 6, so

that by depressing the foot lever of the anvil, the brake is thrown outof engagement with the pulley, the idler tightens the belt on the saidpulley, and the machine is set in operai tion.

the leaf spring may be altered by adjusting the length of the pitmanlinks, the idler pulley may be moved to suit the tightness of the belton the driven pulley, and the tension of the brake spring may beadjusted at will.

'The speed of the machine may be varied by changing the pressure on thefoot lever to tighten or release the belt, and the machine may beinstantly stopped by removing pressure on the foot lever, when thespring automatically sets the brake.

From the foregoing description taken in connection with the drawings itwill be obvious that I have provided a power hammer which is capable ofhandling a great variety of work, and which is thoroughly practical anddesirable in every particular.

As shown in the detail view, (Fig. 11), the hammer is formed with a flatface and a tapering or pointed wedge-shaped face so that it is adaptedfor different character of work. On one end of the hammer is provided agroove 53, and on the opposite end, a series of parallel grooves 54. Thegrooves are adapted for engagement with the bolts in the end of thehammer lever, and the series of grooves or channels allows the block tobe tilted or set at an angle in the end of the lever so as to strike thework parallel to the face of the anvil. When it is desired to use aswage in place of the hammer, thepair of blocks 55, are secured in theend of the helve in the same manner as the hammer, and the meeting edgesof the blocks are formed with complementary cut or recessed portions toprovide a rectangular opening 56. The swage block 57, is of the desiredsize and shape and is provided with a central stud or projection 58,adapted to be engaged in the opening between the clamping blocks 55, sothat when the bolts are tightened, the swage is securely clamped in theend of the helve.

The pitman may be lengthened or shortened at will to adapt the machineto work of various sizes so that the hammer will strike the proper blowwith reference to the size of the work.

I claim:

1. A helve for power hammers comprising in the combination with asupporting shaft, of a pair of spaced parallel bars, spacing bolts forsecuring the parallel bars together, the spacing bolts adapted to clampa hammer or swage blocks between the parallel bars, and clamping meansfor securing the helve upon the supporting shaft.

2. In a power hammer, the combination with journal bearings and asupporting shaft mounted therein, a helve composed of a pair of spacedparallel bars connected by spacing and clamping bolts adjustably clampedupon the shaft, a hammer provided with a series of grooves to receivethe clamping bolts so as to be adjustably clamped between the parallelbars of the helve.

In testimony whereof I afiix my signature in presence of two witnesses.

M. M. CLARK, A. SoHUBLIN.

